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BenGTR (2005-04-07 13:17:20)

Adapting VEMS 3.2 ecu to turbocharged 2.5 liter BMW inline 6 engine which is standard ie. without internal mechanical modifications.

Instrumentation, sensors and operational devices.

  • Crankshaft Speed/Angular Position Sensor (CS)
Standard BMW/Bosch 60-2 trigger wheel with variable reluctance (magnetic type) sensor. Bosch item 0 261 210 001.
  • Manifold Absolute Pressure sensor (MAP)
Genboard mounted (VEMS internal) Motorola (MPX4250AP) (2.5 kg/cm2) absolute pressure sensor.
  • Coolant temperature sensor. (CLT)
Standard Bosch item: 0 280 130 026
  • Inlet Air Temperature sensor (IAT)
Plan is to use Sierra Coswrth IAT sensor. Maybe thin film PT100 sensor could be better (faster response etc). Bosch has '002' fast response air temp sensor, but where to source one ?
  • Throttle Position Sensor (TPS)
Standard Bosch item 0 280 122 001. 5 kOhm angular potentiometer, without idle and full throttle microswitch.
  • Idle Air/Speed Control Valve (IAS)
There are solenoid and stepper types easily available.

For example:

Bosch item 0 280 140 530 which has three pin connector (solenoid type ?).

Bosch item 3 437 010 524 which has four pin connector (stepper type ?).

Todo: update when type selected.

  • Lambda Sensor (LS)
Wide-Band Lambda Sensor (Bosch LSU4). 5 wire special connector, ordered this with the wiring loom connector from VEMS shop.

For example LSU4 Bosch items are 0 258 006 066, 0 258 006 127 etc.

  • Ignition Coil(s)
Standard distributor with 'TZI' coil.

For example Bosch item 0 221 122 411 or 0 221 118 322 (2 ms coil on time, should be enough) or wasted spark coil for the 6 cylinder engine. (Bosch item: 0 221 503 002. 3ms coil on time, should be enough).

Could the distributor (with solid axle, ie. no mechanical advance) type ignition cope the spark advance window needed, is yet unknown (must read another member pages and try out). Afterall wasted spark coils are quite expensive.

Todo: Update when spark delivery type selected.

  • Boost control
Wastegate actuator control device.

This could be; pneumatic mechcanical 'Festo valve' to adjust wastegate actuator opening or electrically controlled solenoid/pneumatic valve.

Todo: Not yet made decision, comments and succestions on this ?

  • Turbo Control
Turbocharger is 'standard' Carrett T03 center core 'hybrid' item, without variable nozzle turbine. Hence not needeing control device.
  • Injectors
Bigger injectors than in standard naturally aspirated BMW engine are needed to cope with increased power level (from 170 PS to around 250-300 PS).

For maximum fuel vaporisation modern 2 to 6 hole injectors are preferable.

For example injectors with suitable flow rate;

Siemens Deka 9267 (has 2 spray holes).

Bosch 0 280 150 744 (one spray hole)

Todo: Injector technical information (impedance, flow rate etc.), when selected.

Wiring loom

  • ECU, standard Genboard v3.2 Econoseal (36 and 18) pin connectors.
  • CS, IAT, CLT, TPS sensors and actuators, 2 and 3 pin AMP junior timer connectors.
  • LS special 5-pin connector, ordered it from VEMS shop.
  • Todo: Schematic and connector pin outs for wiring loom.

Firmware, VE, igniton advance and other tables.

  • pneumatic MAP connection agreed
  • primary_trigger HW for VR signal shaping => no need to change hall type the crank sensor.
  • secondary_trigger interrupt disabled

Todo: Other information will be updated within few weeks.